hacky fix for getISODate()

allocated far to much memory, to allow printing the char* ?

gps.h

@@ -44,9 +44,10 @@ bool updateTime() {
 
 
 /* UTILS */
-String getISODate() {
-  char result[16] = { 0 };
+static char* getISODate() {
+  // TODO: check why we need to allocate that much storage for a 20 character string for Serial printing??
+  char result[100] = { 0 };
   sprintf(result, "%04d-%02d-%02d-T%02d:%02d:%02dZ",
     year(), month(), day(), hour(), minute(), second());
-  return (String)result;
+  return result;
 }

mobile-sensebox.ino

@@ -35,9 +35,9 @@ void setup() {
   DEBUG_OUT.begin(115200);
 
   WiFi.mode(WIFI_STA);
-  connectWifi(WIFI_SSID, WIFI_PASS);
+  //connectWifi(WIFI_SSID, WIFI_PASS);
 
-  delay(5000);
+  //delay(5000); // DEBUG: oportunity to connect to network logger
 
   // wait until we got a first fix from GPS, and thus an initial time
   /*DEBUG_OUT.print("Getting GPS fix..");
@@ -54,10 +54,9 @@ void setup() {
   DEBUG_OUT.print("SPIFF bytes free: ");
   DEBUG_OUT.println(storage.begin());
   
-  digitalWrite(D9, HIGH);
+  digitalWrite(D9, HIGH); // DEBUG: integrated  led? doesnt work
 }
 
-bool firstLoop = true;
 void loop() {
   //pollGPS();
   //DEBUG_OUT.pollClients();
@@ -75,21 +74,28 @@ void loop() {
 
   printState(wifi);
 
-  //delay(20000);
-  if (firstLoop) {
-    Measurement testMeasure;
-    testMeasure.lat = 51.2;
-    testMeasure.lng = 7.89;
-    testMeasure.value = 66.6;
-    strcpy(testMeasure.timeStamp, "2016-08-21T09:07:22Z");
-    strcpy(testMeasure.sensorID, "123457812345678123456781234567");
-    
-    if (storage.add(testMeasure)) {
-      DEBUG_OUT.println("measurement stored! storage size: ");
-    } else {
-      DEBUG_OUT.println("measurement store failed! storage size: ");
-    }
-    DEBUG_OUT.println(storage.size());
-    firstLoop = false;
+  // recall all previous measurements
+  while (storage.size()) {
+    String measure = storage.pop();
+    DEBUG_OUT.println("popped a measurement: ");
+    DEBUG_OUT.println(measure.substring(0, 31)); // size of sensorID
+    DEBUG_OUT.println(measure.substring(32));    // skip the newline char
   }
+
+  // store new measurement
+  Measurement testMeasure;
+  testMeasure.lat = 51.2;
+  testMeasure.lng = 7.89;
+  testMeasure.value = wifi.numNetworks;
+  strcpy(testMeasure.timeStamp, getISODate());
+  strcpy(testMeasure.sensorID, "123457812345678123456781234567");
+  
+  if (storage.add(testMeasure)) {
+    DEBUG_OUT.print("measurement stored! storage size: ");
+  } else {
+    DEBUG_OUT.print("measurement store failed! storage size: ");
+  }
+  DEBUG_OUT.println(storage.size());
+  
+  delay(2000);
 }

storage.h

@@ -8,14 +8,13 @@
 #define MEASUREMENT_JSON_SIZE (JSON_OBJECT_SIZE(5))
 
 struct Measurement {
-  char timeStamp[21];
+  char timeStamp[20];
   float lat;
   float lng;
   float value;
   char sensorID[32];
 };
 
-// TODO: TEST THIS THING!!
 class Storage {
   protected:
   // not needed, as we post the data as json string?
@@ -32,16 +31,15 @@ class Storage {
   }*/
 
   bool serializeMeasurement(Measurement& m, Print& f) {
+    f.println(m.sensorID);
     StaticJsonBuffer<MEASUREMENT_JSON_SIZE> jsonBuffer;
     JsonObject& root = jsonBuffer.createObject();
-    // TODO: fix data model
-    root["date"] = m.timeStamp;
+    // TODO: replace temporary data model
+    root["createdAt"] = m.timeStamp;
     root["lat"] = m.lat;
     root["lng"] = m.lng;
     root["value"] = m.value;
-    root["sensorId"] = m.sensorID;
     root.printTo(f);
-    f.print("\n");
     return root.success();
   }
   
@@ -75,24 +73,12 @@ class Storage {
     if (!dir.next()) return measurement; // abort if storage is empty
     String fileName = dir.fileName();
     File f = dir.openFile("r");
-    measurement = f.readStringUntil('\n'); // assumes that the data does not contain any \n!
+    measurement = f.readString();
     f.close();
     SPIFFS.remove(fileName);
     return measurement;
   }
 
-  /*const Measurement pop(const char* directory = "/measurements/") {
-    Dir dir = SPIFFS.openDir(directory);
-    Measurement m;
-    if (!dir.next()) return m; // abort if storage is empty
-    String fileName = dir.fileName();
-    File f = dir.openFile("r");
-    m = deserializeMeasurement(f);
-    f.close();
-    SPIFFS.remove(fileName);
-    return m;
-  }*/
-
   uint16_t size(const char* directory = "/measurements/") {
     Dir dir = SPIFFS.openDir(directory);
     uint16_t i = 0;